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Derivative Financial Instruments - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2015 | Apr. 13, 2014 | Oct. 11, 2013 | May 10, 2012 | Nov. 08, 2011 | Apr. 08, 2011 | Oct. 11, 2010
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  | 260,417 | 108,507 |  | 150,000
Warrants exercisable date | Apr. 13, 2014 |  |  |  |  |  |  |
Linked common shares | 130,208 | 130,208 |  |  |  |  |  |
Shares available for issuance upon exercise |  |  |  |  | 36,169 | 36,169 |  |
Additional Financing [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Face amount of new loans |  |  |  |  | $ 8,000,000 |  |  |
Warrants Attached to Series G Preferred Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  |  |  | 43,750 |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  |  | 108,507 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  | 525,000 |  |  |  |  |
Common Stock [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  |  | 1,725,000 |  |  |  |
Warrants exercisable date | Oct. 11, 2013 |  |  |  |  |  |  |

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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(3)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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